well-documented

A collection of analyses, "tutorials", walkthroughs and literate implementations of moderately complex standalone applications.

NOTE: When I say "tutorial", it means I don't want to add tutorials like "How to make a React SPA". I want to add tutorials for things that most people have never considered making themselves, and cover aspects of the problem domain rather than the surrounding framework.

Language agnostic

• The Architecture of Open Source Applications
• DOOM Engine source code review
• How I Start. - "[A] mix between a collection of development tutorials and [setup guides]"
• Programs To Read

Agda

• Programming Language Foundations in Agda

C

• Selfie - "An educational software system of a tiny self-compiling C compiler, a tiny self-executing MIPS emulator, and a tiny self-hosting MIPS hypervisor"
• Build Your Own Text Editor (with associated Hacker News discussion)
• Build Your Own Lisp
• Voc - "[A] physical model of the vocal tract"
• The Craft of Text Editing
• Kilo - "A text editor in less than 1000 LOC with syntax highlight and search"
• Raycasting
• Let's Build a Simple Database
• TinyWM - A minimalistic, 50 line window manager
• Write your Own Virtual Machine

C#

• BitTorrent - "Building a BitTorrent client from scratch in C#"

C++

• Design & Implementation of a Win32 Text Editor
• Doom3 Source Code Review
• Let's Make a Voxel Engine
• Physically Based Rendering: From Theory To Implementation

Clojure

• Ferret - A "[compiler of] a restricted subset of the Clojure language to self contained ISO C++11"
• rhymes.clj - Annotated rhyming dictionary

Ruby

• Rhizome - Rhizome is a paedagogical just-in-time compiler (JIT) for Ruby, implemented in pure Ruby.

Commodore 64 Assembly

• A Mind is Born - 256 byte demo

Common Lisp

• Axiom - "The Scientific Computation System"

Coq

• Writing a Formally-Verified Porn Browser in Coq and Haskell

Elixir

• An eInk display with Nerves & Elixir - Getting started with Inky

Go

• A Go implementation of Poly1305 that makes sense
• Database basics: writing a SQL database from scratch in Go
• How to write a (toy) JVM

Haskell

• Corrode - A C to Rust transpiler
• Write You a Scheme
• Write You a Haskell
• The "Writing" section of Reflecting on Haskell in 2016
• Teleport - "How to write a small, useful command line application in Haskell"
• Hindley-Damas-Milner tutorial
• Typing the technical interview - type-level programming abomination
• Glassery - Optics library
• A Tutorial Implementation of a Dependently Typed Lambda Calculus
• Implementing a JIT Compiled Language with Haskell and LLVM
• kinder-functor - "An alternate definition of Haskell's Functor typeclass"
• Rolling your Own Blockchain in Haskell
• Nanochain - "A minimal viable blockchain to demonstrate simple blockchain principles."
• Let's make a GTK Video Player with Haskell

JavaScript

• The Super Tiny Compiler
• A first-person engine in 265 lines
• Build your own React
• Git in six hundred words

OpenType

• Let's make a small font

Python

• (How to Write a (Lisp) Interpreter (in Python))
• How to Write a Spelling Corrector
• tinychain - "A pocket-sized implementation of Bitcoin"
• Let's Build a Web Server
• Let's Build a Simple Interpreter
• Bytecode compilers and interpreters
• List of IPython (Jupyter) Notebooks by Peter Norvig
• Python Prolog Interpreter

Rust

• Building a Multithreaded Web Server - TODO: Update this link when it comes out of beta
• Writing an OS in Rust
• Let's build a browser engine!
• Speedy Desktop Apps With GTK and Rust
• Making our own executable packer
• ToyDB

Scheme

• Let's build a compiler